Dolphins’ coral rubbing parties can be quite the orderly social gathering. “It’s not like they’re fighting each other for the turn.”
Ziltener and colleagues analyzed one-centimeter slices taken from wild corals and sponges. The team identified 17 compounds overall, including 10 with antibacterial or antimicrobial activity. It’s possible that as the dolphins swim through the corals, the compounds help protect the animals from skin irritations or infections, says coauthor Gertrud Morlock, an analytical chemist at Justus Liebig University Giessen in Germany.
Indo-Pacific bottlenosed dolphins living in the Northern Red Sea rub their bodies against gorgonian corals, which contain antibacterial compounds that may help the animals maintain healthy skin.. Marine biologist Jeremy Kiszka of Florida International University in Miami says the new study convinces him that the dolphins are using corals and sea sponges for that purpose. But, he says, additional experiments are necessary to prove the link.
Ziltener agrees there’s more to be done. For instance, it’s also possible that in addition to prevention, dolphins use corals and sea sponges to treat active skin infections, she says, but the team has yet to see proof of a coral cure. Next up though, Ziltener says, is figuring out whether dolphins prefer to rub specific body parts on specific corals in such an “underwater spa.”
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